A face set provides the same flexibility as the patch set with regard to compact file size. It adopts the same principles of defining faces in a separate list to the vertices that they are composed of.

2915 vertices 5688 faces SVG: 400 kbytes SVGZ: 50 kbytes

Figure 9.1: Face Set

<faceset id="face" use="face">
  <vertices>
    <vertex>-90,-5,160</vertex>
    <vertex>-90,-5,-20</vertex>
    <vertex>90,-5,-20</vertex>
    <vertex>90,-5,160</vertex>
    <vertex>-85,0,155</vertex>
    <vertex>-85,0,-15</vertex>
    <vertex>85,0,-15</vertex>
    <vertex>85,0,155</vertex>
    <vertex>-90,-20,160</vertex>
    <vertex>-90,-20,-20</vertex>
    <vertex>90,-20,-20</vertex>
    <vertex>90,-20,160</vertex>
  </vertices>
  <face>7,5,6,</face>
  <face>8,5,7,</face>
  ...
</faceset>

A big advantage to using the faceset element is that objects defined with other graphics packages export data using the same or similar formats.